I picked up some large BG AIOs for my 17 lbs 2 month old with thunder thighs. The weight says 22 lbs to something and the medium said up to 22lbs. I am wondering if these larges will be ok on DS or if I am going to have to wait a while. He's on the medium setting of the BG OS diapers, but I've used it on the largest setting before, too. Either way, I am thrilled to get my hands on some BG AIOs! I loved loved the XS and S, but DH long outgrew the small.